Sliding gear transmission



April 1942- QKYLIN ET AL I 2,279,710

SLIDING GEAR TRANSMISSION Filed April 4, 1959 8 Sheets-Sheet l April1942- KYLIN 'ET AL 2,279,710

SLIDING GEAR TRANSMISS ION Filed April 4, 1959 8-Sheets-Sheet 2 IINVENEORS flewuL gl W M I e I r ATTORNEKS-- April 1942- o. KYLIN ETQAL2,279,710

SLIDING- GEAR TRANSMISS ION Filed, April 4, 1939 8 Sheets-Sheet 5 E r Iilk-55! a Q E Um!!! Q 3 Q \9 m 6 3 Q o I Winn a,

9 x L\ m 1| O k V a g y I y j J l r r K 'r' ATTORNEY;

April 1942- o. KYLIN ET AL I SLIDING GEAR TRANSMISSION 8 Sheets-Sheet 4Filed April 4, 1939 A v INVENTORJ v 0 "I W1 0444 BY 1 M 74/ new frromrswl o. KYLIN ET AL 2,279,710

SLIDING GEARv TRANSMISSION 7 Filed April L 4, 1939 8 Sheets-Sheet 6 2 FJ A 5 I l I l IT I I N VENT 0R3 7; r y ATTORNEYS April 14, 194 2.

O. KYLlN ET AL SLIDING G1:JAR TRANSMISSI ON Filed April 4, 1939 sSheets-Sheet 7 INVENTORS r" g v April 1942- o, KYLlN ET AL 2,279,710

SLIDING GEAR TRANSMISSION Eiled April 4, 1939 8 Sheets-Sheet 8 INVENTORSBY M a lg l.

77 ATTORNEY? Patented Apr. 14, 1942 OFFICE SLIDING GEAR TaANsr/nssioriOskar Kylin and Henrik o. Kylin, Cleveland, Ohio, assignors to Bar-donsand Oliver, Ina, Gleveland,i Ohio, a corporation of Ohio ApplicationApril 4, 1939, Serial No. 255,951

25 Claims.

This invention relates to a hydraulic preselector speed changingmechanism for sliding gear trans-' mission, and relates moreparticularly to such meanswhich may be applied to machine tools, such asturret lathes, to preselect the spindle speeds.

It is one of the objects of this invention to preselect the spindlespeed of a machine tool, such as turret lathes, engine lathes, drillpresses, boring machines, milling machines, and the like, whereby uponsubsequent operation of a single control means to disengage the powerand engage the gears of the transmission, a spindle speed will beobtained according to the preselected speed indicated by thepreselector.

Another object of the invention resides in the provision of a hydraulicpreselecto-r including a control or selector valve of simpleconstruction and preferably of the cylinder type whereby a plurality ofgear shift 'cylinders may be conveniently operated by selectivelyrotating the dis tributor element of the valve.

Another object of the invention is to provide in a preselector of theabove named character a mechanism for timing the brake and clutchactions with the gear shifting means.

Another object of the invention is to provide in a hydraulicallyoperated sliding gear transmission means for preselecting one or moresucceswill become more apparent from the following description of oneembodiment of the same, reference being made to the accompanyingdrawings, in which like reference characters are employed to. designatelike parts throughout the same.

In the drawings Figure 1 is a frent elevation of the head of a turretlathe and shows the means for preselecting the spindle speed andindicating the selected speed, together with the manual control brakeand clutch lever; v

Figure 2 is a front end view of the same with part of the head casingbroken away;

Figure 3 is a horizontal section through the casing and illustrates thehydraulic cylinders employed to shift the sliding gears of each: ofseveral clusters; k v

Figure '4 is a section through the head, illustrating the transmissionand clutchm echanism more in detail, 'and is taken alongline 4 -4 ofFigure 2;

Figure 5 illustrates the hydraulic. systememployed including thepump,the preselector valve and the several gear sliding cylinders;

Figure 6 is a section taken on line 6-4: of Figure 16 through theauxiliary valve;

Figure '7' is a section taken on line auxiliary valve shown in Figure 5;

Figure 8 is an enlarged end View of unit shown in Figure 5, and is takenin the direction of line 8-8 as indicated;

Figure 9 is a view similar to that of Figure 8 and taken in thedirection of line 99 of Figure 16, but shows a slightly? alteredposition of the parts; g

of the Figure 10 is an enlarged detail of the manual control taken inthe direction of line Ill-40 of Figure 2; f

Figure 11 is a vertical section through the pro-1 selector indicatormeans;

Figure 12is a front view of the preselector indicator; I

Figure 13 is a transverse section taken on line 13-43 of Figure 12;v

Figure ii is a plan view of one of the indicator clips which may beapplied to the preselector indicator; I

Figure 15 is a front view of the clip shown in Figure 14;

Figure 16 is. a longitudinal section through the auxiliary valve shownin Figure 5 and illustrates the movable parts intheir extreme oppositelimit of travel as compared to thepositions shown in Figure 5;

Figure 1'7. is a transverse section through the auxiliary valve taken online ll-ll of Figure 16;

Figures 18 to 28 inclusive are transverse sections through thepreselector valve. in Figure 5 andare taken on the respective linesindicatedin that figure. These views illustrate the relative positionsof the various ducts and parts in the valve when it is set to thepreselected position shown in Figure 5;

Figure 29 is a view of the stop bloc-ks taken in the direction of lines2929 of Figure 10, and

shows their relativepositions when the forward the cylinder .when thecontrol lever is in gear shifting posi- Referring now to the drawingsmore in detail,-

we will proceed to describe the structure and operation of theembodiment of our invention illustrated herein.

means 55 for receiving clutch disks. As is the usual custom, these disksmay be formed with radial keyprojections which operate in axiallyextending slots in the gear extension 55 so as As shown, the inventionis applied to turret lathes, although it will readily beappreciated toprovide axial movement of the clutch disks and at the same time,preventing relative rotation thereof.

Likewise, the gear element 42 is similarly extended rearwardly forpositioning and receiving the second set of clutch disks. Alternateclutch disks are carried by the shaft 34 and are movable axially of theshaft, but not circumferentially thereof. These disks are free of theclutch that the invention is equally well adapted to other machinetools, such as engine lathes, boring lathes, drill presses; millingmachines, and the, like.

The head stock is indicated generally at iand comprises a casting withinwhich is housed a speed change transmission gearing, the selector valve,the. control valve, the pump andothe parts which will be described indetail. i. i

A cover 2| is removably fixed on thecasing by any suitable means. v

'Referring now more particularly to Figure 4,

we have shown in sectionthat portion of the,

casing housing the transmissiorh The drive shaft 22 is mounted insuitable bearings 23, 24, and 25 'lengthwiseof the casing, and

is equippedatone end with av drive pulley '26 gears, 4| and 42. Thus, itwill be seen that when. the plunger 38 is, for instance, moved to theright'in Figure 4, the member 54 will rock the fingers 45 and 46 abouttheir pivots to thrust the spacer ring and compress the clutch diskshaving connection with a suitable source of power through a belt. ,It isunderstood that a direct drive may be provided for the shaft 22 byconnecting the same directly to an electric motor in any suitablemanner. Y i

The forward end of the drive shaft is splined to receive a gear cluster21 comprising the gears 28 and 29 at opposite ends thereof. 1

To the end of the shaft is directly connected a stub shaft 30 carrying apump gear 3| which is in mesh with gear 32 rotatably mounted in thecasing 33. The pump gears 3| and 32' comprise an oil pump, the purposeof which will 'be described more fully hereinafter. Mountedlongitudinally in themain housing 20 is. a second shaft 34' which maybetermed the clutch shaft, rotatably supported by the-bearings-35, 36and 3|. I

The shaft 34 is hollow to telescopically accommodate the plunger 38,which extends axially through theshaftfrom one end to the otherand isprovided at its forward end with the spool33 having connection with afork 40 which is more generally indicated in Figure 2. g i

The forward end of the shaft 34 carries the forward and reverse clutchgears, indicated at 4| and 42-respectively, and respectively mounted torotate on bearings 43 and 44 on the shaft.

Clutch fingers 45 and 46 are rockably mounted posite points in theshaft. v Each clutchfinger is provided with a projecin slots 41 and 48provided at diametrically option 49 whichbperates in an annular grooveor slot 50 in the clutch spacer 5|.

An intermediate connection 54 is formed the plunger 38 and has slidingengagement with the clutch fingers 45 and 43 sothat when the plunger 38is moved axially in'the shaft 34, the part 54 will rock the clutchfinger elements about their pivots to cause'a resultant shifting of thespacer ring 5| in one direction or the otherin accordance with thedirection of the movement of the plunger 38. i

The gear element 4| extends in the direction of the forward end of theshaft 38 to provide and alternate disks to the left and thereby engagethe drive from the gear 28 to the gear 4| and thence through the clutchto the shaft 34. When the plunger 38 is moved .to the left in Figure 4,the action of the clutch fingers is reversed to compress the reverseclutch plates and to thereby engage the drive through the gear 29, theidler gear 53 and the reverse clutch gear 42 to thereby drive the shaft34 in a reverse direction to that which has just been described.

The rearward end of the shaft 34 is provided with means to brake therotation of the shaft 34 and through it to the several selective gearclus ters. The plunger, as has been stated before, operates through theshaft 34 and terminates beyond the rear end of theshaft in the housing51. A brake cup 58Ihaving inclined inner walls,

is fixed in the housing 51 and receives a brake cone 59 having similarlyinclined external walls and which is keyed to the shaft 34.

The rear end of the plunger 38 is provided with an annular seat orgroove 60 in which are seated a plurality of balls 3|. The balls filride between the membersx62 and 63 against the inclined surfaces thereofas indicated at 64. The

member 63 is threaded to the end of the shaft 34 and rotates therewith.

A coiled compression spring 85 is housed in a space provided between thebrake cone 59 and themember 63. The plate 62 rotates with the brake coneand is secured to the cone by means of bolts 66.

Thus it will be seen that when the plunger 38 is moved either to theright or left in Figure 4, that the balls 6| will be unseated from theannular groove '50 in the plunger and will tend to spreadmembers B2 and63 apart, thereby imparting opposite relative movement between the brakeV coneand the shaft in an axial direction.

In this manner the spring is compressed and the brake cone and cup aredisengaged. When the balls are seated in the groove 60, as shown inFigure 4, the brake elements are in braking engagement.

Forward or reverse drive of the shaft 34 is transmitted through asliding gear cluster, which shown in Figure 4, is more or lessconventional and may be described preferably as follows: a splined shaftH is mounted in suitable bearings 12 and 13 and carries the gearclusters 14 and 15, the gear cluster 14 comprising the gears 16 and 11.

the cylinder H6. At the same time the cylinder 7 As shown, the gear 11is in mesh with the high speed gear 59 of the gear cluster splined tothe shaft .34.

g The gear cluster at comprises the gears 18 and 1,9, the high speedconnection being further transmitted through the gear 18 to a gear 80 ona shaft 8|. The shaft BI is supported in bearings 82 and 8.3 in thecasing and carries a gear cluster comprising the gears 80 and .8 3splined to the shaft and a cluster comprising gears 85 and 86 alsosplined to the shaft. The high speed drive is transmitted through thegear 85 to a gear 81 keyed to the spindle shaft 8.8. Spaced from thegear .81 by means of a spacer 58.9 is a gear 983 which is also keyed tothe spindle shaft .83. The spindle shaft is mounted in roller bearings91 and 92 and extends longitudinally of the easing as shown.

Referring now more particularly to Figure 3 of the drawings, weillustrate the several gear cluster operating cylinders, the slidinggear clusters being shown in the same relative position as shown inFigure 4.

As will be described more fully hereinafter, these operating cylindersare connected through a selector valve to a source of fluid underpressure.

In Figure 3 the operating cylinder 93 is connected through suitablemeans, such as a plunger rod 9% and a bell crank '95 to the triplesliding gear cluster 88, S9 and ID on the shaft 34. The operatingcylinders 96. and 91 are connected through similar means to therespective sliding gear clusters 89, B t, 85 and 86 on the shaft 3L Wewill now proceed to describe the means for distributing fluid underpressure to the cylinders 93, 9'6 and 91. This means includes a selectorvalve which is mounted on thecover and lies within the chamber of thecover. This selector valve is operated by the preselector means whichwill be described more fully hereinafter. Primarily the selector valvecomprises an outer shell 98which is cylindrical in cross section andwhich is provided with an end plate 99 at the base thereof, there beinga connection communicating fluid under pressure from the control valveI52 to the rotor. The rotor element of the selector valve comprises, inthe illustration shown, a plurality of sections Ifiil, Iii I, E92superimposed one upon the other and having a common axial inlet I03communicating with the opening in the base plate 99 and the conduit Ileading from the control valve.

-Each of the rotor elements is provided with radial openingscommunicating with the axial opening Hi3 thereof for communicating fluidunder pressure between ports through the side wall of the shell 98 andthe axial opening I03.

With the valve in the position shown in Figure 5 it will be seen thatfluid entering the rotor through the conduits I and H33 will passthrough the port Hi4 in the lower rotor section I92 and out through theconduit 185 to the intake port I08 of the positioning valve controllingthe triple gear cluster operating means. This operating means isprovided at one end with a positioning valve comprising a plug memberI91 rotatable transversely in the casing 408. The oscillatingpositioning valve is provided at one end with a lever Hi9 having a pinIIli operating in the slot III formed in the end of the plunger rod 7H2. In the position shown in Figure 5 and in Figures 1 and 8 the .oilwill pass through the valve plug I81 and the opening H3 therein to theport H4 in the casing Il5 which leads to will exhaust through the portH1 and the conduit II8. I

When the valve plug isrotated to its opposite extreme limit of motion bya plunger rod I12 operated by the piston H9 in the longer cylinder I28,the oil entering the plug at I06 will be transmitted to the port :I I1in Figure '1 to the opposite side of the piston I2I in the smallercylinder I I6, while the opposite end of the cylinder williexhaustthrough the conduit Ill and the port 2122 in the valve plug.

The piston in the smaller cylinder is connected through the connectingrod I23 and the push rod I24 which is slotted at I25 to receive a crosshead I26 carried on the end of the longer piston rod I21 operated by thepiston H9 in the longer cylinder I20.

Thus, when the parts are in the position shown in Figure 5, fluid willbe transmitted to the piston l2I to actuate the same to the left,thereby causing the cross head I26 to pull the pistonl I9 in the longercylinder to an intermediate position. As the piston in the largercylinder approaches the intermediate position, it will be noted that theselector valve is so positioned that the conduits I16 and I11 on theopposite sides of the piston are in exhaust communication through thevalve unit I02 and port I86 in the selector valve casing.

Referring now more particularly to Figure 16, which shows the twopistons in reversed position in the respective cylinders, the operationis substantially the same as described in connection with the parts inthe position shown in Figure 5, except that the piston I2Iin the smallercylinder moves to the right to urge the piston He in the larger cylinderto the right toward an intermedi-' ate position and the respective portsH4 and H1 become inlet and exhaust ports.

When the selector valve is turned to admit the oil to the right side ofthe cylinder I28, the piston II 9 travels to the left approximately halfthe distance without moving the piston 12! in the smaller cylinder, butas the piston I I9 passes the intermediate point, it will, through theconnection of the cross head with the connecting rod of the piston I2I,move said piston with it so that both pistons will be in the positionindicated in Figure 16.

During such operation the plunger rodi I2 will engage the pin III in thevalve plug head and The cross head I26 is connected through the .bellcrank pivoted at I28 to operate the triple gear cluster '68, 69 and 10,which is splined to the shaft 34.

We have also provided cylinders '96 and 91 in Figure 5 and Figure 3 foroperating the respective sliding gear clusters 80,84, 85, and 8 3 asindicated.

Each of these cylinders comprises essentially a cylinder in which apiston and rod reciprocate, the rod in each case having connection withthe respective bell crank of the operating unit.

Each cylinder is provided with ports in its side walls for receiving andexhausting the oil through the selector valve in accordance with theselected position of the valve.

The cylinders are mounted to pivot or rock on Referring again moreparticularly to Figure 5, in which we have illustrated the selectorvalve, and means for distributing oil inthe valve to the variouscylinders, we haveindicated the oil supply pump comprisingthe pump gears3| and 32. -Oilis fed into. the pump through the conduit I and is fedfrom the pump into the conduit I5I to the control valve I52, there beinga by-pass I53 around the pump and through a relief valve indicated.generallyat I54 and which is of the usual construction. v .1

.The control valve consists primarily of .a casing I52 in whicha plungerI is normally urged to its uppermost position by meansof a coil springI56, exerting a force of compression against the, valve head I51 to seatthe same against the seat I58 from the casing I52.

Oil under pressure is delivered into the chamber I59 and when thevvalve1=is opened, passes around the valve head I51-and up into the body ofthe valve and out through the conduit I in which it is delivered to theaxial opening I03 through the superimposed valve units I00, I 0|, andI02.

From the axial opening I 03 the oil is distributed through radial portsprovided in each of the inner valve units I00, IOI, and I02. In order tomore clearly understand the construction and operationof the selectorvalve as shown in Figure 5, we have illustrated in Figures 18-29sections taken through each of the units in parallel horizontal planes.

Figures 18, 19, and 20 are horizontal sections through the upperinternal valve unit I00 and are taken on the lines indicated in Figure5.

As shown by the sectional views through each unit, a plurality ofradially arranged ports are provided communicating, the central port'I03 with ports provided in the shell 98 of the valve upon apredetermined position of the unit.

The arrangement of radial ports in the several valve units operatingwithin the shell is such that predetermined delivery and exhaust of oilthrough certain circuits feed preselected cylinders, and may readily bedetermined by the operator merely by rotating the valve to a preselectedposition as indicated by the preselector means shown in Figures 11 and12. v

It is to be noted that the upper unit I00 is pro- 5 vided with anoperating stem I6I, which projects up through the neck of the shell andthrough the cover of the transmission housing and into the preselectorindicating unit controlling the operation. of the valve.

Each of the units I 00, IM and. I02 is grooved annularly on its upperand lower surfaces near the periphery thereof so that when the threeunits are superi'mposedone upon the other, annular conduits I62, I63,I64, and I are formed.

Positioning pins I66 and I61 serve to properly align the three valveunits when they are assembled, one above the other in thecasing, and tomaintain this alignment during rotation of the units as a whole. 65

Vertical openings I69 are drilled through that portion of the top ofeach unit comprising the annular groove and communicate below with shortradial holes 2 I8 formed inwardly from the periphery of the unit, butnot communicating directly with the central conduit I03. Likewise, othershort radial openings may also be formed .in the lower portion of eachunit to communicat downwardly with the annular groove formed in thelower surface of the respective unit.

2,279, bolts' l29 which'support them in the casing 20.

' The arrangement of the radial conduits communicating the outside ofthe respective units with the central conduit I03 is predetermined sothat when the units are assembled and'locked together,properdistribution of oil to the several cylinders, proper exhaustthrough the preselector valveand proper timing of distribution andexhaust will be assured for each preselected spindle speed to whichthe'machine is set to operate.

It is understood that the specific port arrangements in the preselectorvalve, as illustrated herein, while desirable, need not be the onlyarrangements thereof which may be selected to properly operate thespindle at preselected speeds. I

Returning again to Figure 5, when the valve units I 00, IOI, and I02 arein a position shown, the position of the gear cluster operating meanswill be as shown in Figure 3.

Reference has already been made to the operation 'of th triple gearcluster and the manner in which the valve distributes and exhausts oilto the auxiliary mechanism controlling this cluster.

The cylinder 96, which is connected to operate the gear cluster 80, 84,is also connected with the valve shell through the conduits I10 and HIwhich feed and exhaust oil on opposite sides of the piston I12 operatingits associated bell crank. These conduits are connected through theupper unit I00 of the valve to the source of oil under pressure and toexhaust.

Likewise cylinder 91, whose piston I15 operates the gear cluster 85, 86,is connected by means of conduits I13 and I14 with the preselector valvethrough the intermediate valve unit IOI to supply and exhaust oiltoopposite sides of the piston I15 therein.

The lower valve unit I 02 is connected by means of the conduits I16 andI11 with opposite sides of the piston II9 operating in a longer cylinderin the auxiliary control means for the triple gear cluster, and serve tosupply and exhaust oil on opposite sides of the piston in th cylinder,as in the'case of the previously mentioned cylinders 96 and 91. Aconduit I05-also communicates with the lower valve unit I02 and with thecontrol valve of the auxiliary operating means for the triple gearcluster to feed oilunder pressure through the said control valve tooperate the piston I2I in the shorter cylinder of this unit.

Referring now to Figures 18 to 28 inclusive, which show horizontalsections through the valve units I00, I M and I02 as they are positionedin Figure 5, the radial port I is shown in communication with theconduitl 10 which has delivered oil to theleft face of piston I12, andwhich has moved the piston to the right.

In Figure 20 the conduit "I is shown in communication with the exhaustopening I8I, the annular groove I63 and the exhaustport I86. Thus itwill be seen that when oil is admitted through the valve and thusthrough the upper unit I00, no movement of the piston I12 will takeplace.

This is also true in conn I 15 in the cylinder 91.

However, when the operating valve I55 is depressed, oil will betransmitted through the lowection with the piston er valv section I02and through the conduit I05 0 to operate the positioning valve I09 ashas been described hereinbefore, to shift the triple gear cluster.

Assuming now that a spindle speed is selected in which the valve unitswill berotated from the position shown in Figur 5,-and in Figures 18-29,the distribution and exhaust of 011 will be as follows:

Referring to Figure 19, the duct I85 will then be aligned at a pointdiametrically opposite from the position shown, and the exhaust openingI82 will be in communication with the conduit Ilil.

In the same manner the exhaust opening I81 in;

fed through the conduit Ill and against the right. face of the pistonI12 to force the piston to the left and at the same time exhaustoil'from the cylinder through the conduit IIIl to the opening I82 andfinally out through the exhaust opening in the casing, indicated at I86.

Similarly, referring to the intermediate unit 16!, which, as explainedabove, likewise has been rotating 180, the conduit I81 extendingdiametrically through the unit will have been moved in Figure 22, butsuch movement will still provide communication between the intake H33and the conduit I13 to supply oil to th left side of the piston I75, InFigure 23 it will be noted that there likewise Will be no change intheoperation by rota-ting the unit 180 because the exhaust port I88 willhave replaced the exhaust port I89 in communication with the conduitI'M. Consequently, there will be no motion of the piston H5 in thecylinder 9?. In connection with the lower unit of the valve in Figure 5,which, when rotated 13!)", the conduit I" will remain connected to anexhaust port I86 in the lower part of the casing through the openingI90, the radial opening I 9 I will have been moved to communicatethrough the conduit I16 and the radial port I52 will have been: movedout of communication with the conduit I95 (Fig. 2'7 and the latter willhave been connected: to exhaust through the opening I93, the groove I55and the port I85. Inthis position, oil. will be fed to operate thecontrol valve I89. At the same time, oil will be fed through the conduitH6 to thrust piston H9 of the triple cluster gear operating means to theright from its intermediate position in its cylinder.

It is obvious that various other combinations of delivery and exhaustthrough the several cir cults connected with. the several cylinders maybe made, and it. is by this means that we are enabled to preselect anyone of considerable number of spindle speeds in operating the machine.

Referring now more particularly to Figures 1, 2,111, and 12, we haveillustrated a novel means for operating the preselector valve, and atthe same; time to indicate directly to the operator of thermachine thespindle speed preselected as well as to; provide means for quicklypreselecting subsequent spindle speeds in a regular order.

This means includes a casing I94 which is removabl'y attached to thecover 21. The front face of the casing is provided with a scale I95reading in feet per minute, along the side of a window I95.

The stem IBI of the preselector valve extends upwardly through thecasing 21 and terminates in a. prolonged shank and telescopicallyreceives the rotatable element I91 of the spindle speed indicator andoperating means handle I98, and is attached thereto-by means of: a boltI99 passing through the element. I51 andi'threaded into the stem. EGI,

The: upper portion of the rotatable indicator member is provided with.grooves 25!! extending longitudinally downward from the top bathe memberand equally spaced around the periphery thereof to provide intermediateridges" 201' for" receiving indicator clips zflz. There isalso a windo'w2-Il3 'formed in the casing of theindicato and "directly above thewindow rec.

The scale I is graduated on opposite s'idesof thewindow I95 within'diciaindicating feet perminute, while theelement I 91' carriesa scale 204behind the windows I95 and 283 bearing indicia relating to diameter;that is diameter of the work, and to spindle speed respectively. By thisarrangementthe operator can preselect a desired spindle speed byrotating the element I91 and aligning the diameter of the Work with theproper indicated feet per minute speed on the scale I95. a

Referring, nowmore particularly to Figures i 1., 2,. 5: and 10, Wehaveillustrated the'detail con 'structionof a control lever for operatingthe preselector valve, i

With particular reference to Figures 1, 2 and 10, the control lever isshown at 285, and. comprises the handle portion extending over thecasing. 28' and the cover therefor toa convenient point for operationand gripping by the operator.

The forward endof the lever terminates'in an: enlarged portion; orheadiflt which is pivotally supported for swinging about a,verticalaxis: or

stud: 207i carried'by the forked block 298. and

which operates in an opening in. theicover. Thev stud extends downwardlyin a suitable bearing andis' connected by means of a link 2fl9to thefork d0, whichis operatively connected to the clutch shaft 28 shown inFigure 4. The forked block. 2&8 extends upwardly on opposite sides ofthe forward end of the lever designated at ZIII', the end ofv the leverbeing pivotally mounted in the fork by means of a pin 2IiI lying alonga.

horizontal axis with respect to the stud 201. The

'studZIJI' and theblock 2Il8'are preferably formed as an integralunitrand, by virtuezofthe vertical and horizontal pivot means, thelever. is: capable of movement in" these directions for purposes whichwill be: described more; fullyhereinafters'.

The leverin: its movement about thehorizontal axis defined by the pin 2Mis; normally urged so that its handle end; will: move upwardly when thecontrol leveris in a predetermined position.

At 2 I2: we'have illustrateda spring for normally urging the lever to:its: position.v The extreme forward: end of lever indicated at'2I-3; isformed with a downwardly projecting nose which is: at:-:

tached to enter a slot 2 formed in the .ade I jacent portion of thebracket 33 when the control lever is shifted to a predeterminedposition.

When the lever is in this position, the detent will urge the lever aboutits horizontal pivot to engage. the nose 21-5 in the slot 214.. Thisposi tion of the control'lever represents the neutral orbraked'position. I The control levercarries a" trip block: 2 I5 which isbolted thereto as shown in Figure 2; and. is. provided along its' under.face with a groove 216' position and when'the lever depressed about Iits horizontal axis: When the lever is. depressed in.this position-,*itwill be noted that the trip block 2I5', extending directly overthezplunger I55 of the control valve, will: engage the same to; depressit andQth'us admit, oil from, the pump to the preselector valve,as-indicated moreclearly in Fi gure 5. It willalso be noted that, byvirtue ofthe construction described above, the control lever cannot betripped to actuate the plunger of the control valve,1.while thei clutchis operativelyconnected, o, H Y :AWhen the control leverisswung in onedirectionya preselection, of. gear ratios is made in a.

forward directionasdetermined by the position .of ;the preselectorcontrolling the position of the preselector .valve. When= the controllever is swungto the extreme opposite position, a selection, maybe madespindle.;' ..,;,When it is desired to brake the drive through thespindle, the lever is swung about the vertical pivot until the nose2l3pthereof is immediately above the slot; 2 l,4,.at which. point-thespring detent 2l2,willurg e1 the nose into the slot, auto maticallyproviding a neutral position-or brake for the drive mechanism. 1 I 7 iWhen the lever is in the neutral or, brake position as described, theoperator-cannot accidentally move theleverabout its vertical axis whil.the, parts are in the position described.

Duetothe. positioning *ofxthe block 2l5 over thestop 2H; and therelationship of the slot 2l6 thereto, the. plungerjl55 of. the controlvalve; cannot be depressed to shift the.gears unless the ofseveralspeeds obtainable insaidgear transmission,. said preselector meansincluding a selector valve, means for distributing. fluid under pressurefrom the valve to slide-thegearvclusters in saidtransmission, means forcontrolling the mounted for pivotal movement about axes lying for,reverse rotation of the control lever mounted on said machine tool, saidlever being rockable in one, direction to actuate the clutch and,rockable inanother direction to actuate said hydraulic means subsequentto a preselected setting of the spindle speed.

4. In a ma-chinetooLa driven spindle, a sliding gear transmissionforrotating' the spindle at selected speeds, hydraulic means forshifting the slidinggears of the transmission, means for preselectingthe speed at which the spindle is rotated, a clutch, ;a control memberoperable to release the hydraulic means and substantially simultaneouslyeffect a driving. connection through the clutch and gearing withthespindle shaft at a preselected spindle speed, and means cooperatingwith'the control member to prevent actuation of the hydraulic meanswhile the clutch is operatively connected.

5. In a machine-of the class described, a sliding gear transmission, awork spindle driven by said transmission at preselected spindle speeds,

' hydraulic means'for "selecting each of several speed ratios obtainableby said transmission, said selecting means including a preselector valvehaving operable connection with each of the several gear clusters ofsaid transmission, manually-operated means for preselecting the valveposition in accordance with the spindle speed desired and acontrolmember adapted to pivot about each .of two axes lying -inintersecting planes to effect a driving connection with the work spindlewhen moved about one axis and to release fluid under-pressure throughsaid preselector valve when, moved about said other axis.

6. In a machine of the class described, a sliding gear transmission, awork spindle driven by said transmission at preselected spindle speedsdelivery of "fluid under pressure to said valve, i and a control memberfor actuating said control means, said control member comprisinga-lever. 1

in intersecting planes, saidpivotal -movement about one of said axesbeingutilized to actuate said control means. r t 2. Ina 'speedchangingmechanism for sliding clutch. and 1 said control means, .said membercomprising a (lever mounted for pivotal movement about axes lying inintersecting .planes, said pivotal movement about one of said axesbeingutilizedlto actuate said control means and pivotal movement about.said other axis. causing actuation ofsaid .clutch.

' 13.; In: a machine. tool, la driven spindle, a sliding geartransmissiomcomprising. a plurality-of gear clustersfor rotatingthespindle at selected spindle: speeds, a clutch, means for preselectingsaid-spindlespeeds; hydraulically operated mechand hydraulic meansforselecting each of several speed ratios obtainable by saidtransmission, said selecting means including a preselector valve havingoperable connection with each of the several gear clusters of saidtransmission, fluid cylinders associated, with each movable gearcluster, manually-operated means for preselecting the valve position inaccordance with the spindle speed desiredya clutch control memberoperable independently of said valve operating means, a clutch in saidtransmission, and a control valve for feeding fluid under pressure tosaid preselector valve, said clutch control member also beingoperativelyconnected with.said control valve.

7. In a machine of -the class described, the combination with ahydraulically operated sliding gear transmission, including a clutchshaft, of clutch operated means for driving said shaft in reversedirections, brakingmeans carried by said shaft,. a plunger slidablewithin the shaft for operating saidclutch and brake, and a manualcontrol member for sliding said plunger whereby to simultaneouslyrelease the brake on the clutch obtainable by said transmission, saidmeans including a preselector valve having operating hydraulicconnection with each of the several gear clusters of the transmission,indicating means for setting saidvalve for a preselected spindle speed,and a control lever movable about axes lying in intersecting planesforadmitting fluid under pressure to said valve when moved about one ofsaid axes and for effecting a driving connection through saidtransmission when moved about the other of said axes.

9. In a machine of the class described, the combination with ahydraulically operated sliding gear transmission, and a work spindledriven by said transmission, of means for directly effecting any one ofa plurality of spindle speeds, said means including a preselector valvehaving operating hydraulic connection with each of several gear clustersof said transmission, indicating means for setting said valve for a,preselected spindle speed, amanually operated control member foradmitting fiuid under pressure to said preselector valve, saidpreselector valve comprising an outer casing having feed and exhaustports therein, and an inner rotatable member consisting of a pluralityof superimposed sections rotatable in the casing as a unit and havingprearranged passageways therein for feeding and exhausting fluid underpressure with respect to the ports in the casing, the predeterminedpositions of said ports in the casing and the relative arrangement .ofthe ports in'the superimposed sections being such that upon rotation ofthe inner valve member to a preselected position and upon. operation ofsaid control member admitting fluid under pressure to said preselectorvalve, said spindle will respond to a preselected spindle speed.

10. The combination with a sliding gear transmission including a driveshaft, a driven shaft and a plurality of intermediate sliding gearclusters, of a clutch, a clutch operated shaft intermediate the driveshaft and the several gear clusters, a brake on said clutch operatingshaft, hydraulic means for selecting each of several speed ratiosobtainable in said transmission, and a single control lever movableabout axes lying in intersecting planes, said lever actuating saidclutch, brake and hydraulic means in a predetermined timed relation whenmoved about one of said axes and actuating said hydraulic means whenmoved about the said other axis.

11. The combination with a, sliding gear transmission including a driveshaft, a driven shaft, and a plurality of intermediate sliding gearclusters, of a clutch, a clutch operated shaft intermediate said driveshaft and the gear clusters, hydraulic means for selecting each ofseveral speed ratios obtainable in said transmission, a control valveand a single control means operable to actuate said valve and saidclutch, said control comprising a lever operable about intersectingaxes.

12. The combination with 9, sliding gear transmission including a driveshaft, a driven shaft, and a plurality of intermediate sliding gearclusters, of a clutch,'a clutch operated shaft intermediate said driveshaft and the gear clusters, a brake on said clutch shaft, hydraulicmeans for selecting each of several speed ratios obtainable in saidtransmission, and a single control for actuating said clutch, brake andhydraulic means in a predetermined timed relation, said controlcomprising a member operable about intersecting axes to actuate saidclutch and brake in timed relation when operated about one axis andmovable about the other axis to actuate said hydraulic means.

13. The combination with a sliding gear transmission. including a driveshaft, a driven shaft, and a plurality of intermediate sliding gearclusters, of a clutch, a clutch operated shaft intermediate said driveshaft and the gear clusters, a. brake on said clutch shaft, hydraulicmeans for selecting each. of several speed ratios obtainable in saidtransmission, a: single control for actuating said clutch, brake andhydraulic means in a predetermined timed relation, said controlcomprising a member operable about intersecting axes to actuate saidclutch and brake in timed relation when operated about one axis andmovable about the other axis to actuate said hydraulic means, and means.to prevent the movement of the lever about said other axis except whensaid clutch is disengaged.

14. The combination with a sliding gear transmission including a driveshaft, a driven shaft, and a plurality of intermediate sliding gearclusters,.of a clutch, a clutch operated shaft intermediate said driveshaft and the gear clusters, a brake on said clutch shaft, hydraulicmeans for selecting each of several. speed ratios obtainable in saidtransmission, and a single control for actuating said clutch, brake andhydraulic means in a predetermined timed relation, said controlcomprising a member operable abcutintersecting axes to actuate saidclutch and brake in timedwhen said clutch is disengaged, said last namedmeans comprising interf-lttingv members, one of whichis carried by thelever. V

15. In a sliding gear transmission a driv shaft, a driven shaft, aclutch intermediate said shafts, sliding, gear clusters intermediatesaid clutch and the driven shaft, and hydraulically operated means forselecting each of several speed ratios obtainable in said transmission,said last named means including a preselector valve, means as-. sociatedwith each gear cluster and operable through said valve for sliding therespective clusters, and a control valve for supplying fluid underpressure to the preselector valve, and means for engaging anddisengagingsaid clutch and operating said control valve, said last namedmeans being movable about two axes whereby movement about one of saidaxes will cause said and hydraulic means for sliding said clusters in--a cluding a preselector valve, a control valv'e,..a

single control means for operating the control valve and said clutch,and means for selecting the position of said preselector valve duringengagement of the clutch but prior to a subsequent speed change of thespindle shaft for which the selection is'made.

17. A hydraulically operated sliding gear transmission including a driveshaft a. clutch, a driven.

spindleshaft, a plurality of sliding gear clusters, and hydraulic meansfor sliding said clusters including a preselector valve, a controlvalve, a single control means for operating the control valve and saidclutch, and means for selecting the position of said preselector valveduring engagementof the clutch but prior to a subsequent speed change ofthe spindle shaft for which the selection is made, said last named meanscom-.

prising an indicator having indicia thereon indicating the spindle speedpreselected.

18. A hydraulically operated sliding gear trans-a mission including adrive shaft, a'clutch, a driven spindle shaft, a plurality of slidinggear clusters, and hydraulic means forsliding said clusters including apreselector valve, a control valve,a single control means for operatingthe control valve and said clutch, and means for selecting the positionof said preselector valve during engagement of the clutch but prior to asubsequent speed change of the, spindle shaft for which the selection ismade, said last named means comprising an indicator having indiciathereon indicating the spindle speed preselected and having meansassociated therewith whereby a plutrol member for sliding said plungerwhereby to simultaneously release the brake on the clutch shaft whentheshaft is driven in either direction of rotation and to operate-saidcontrol valve.

20. In a sliding gear transmission a plurality of sliding gear clusters,a driven shaft, one of said clusters comprisinga triple gear unitslidable on said shaft, and means for sliding said triple gear clusterto any one of three positions, said means including a cluster shiftingmember,

and a control means for said member, said con trol means including asource of fluid under pressure, a positioning valve, means forcontrolling the flow of fluid to said valve and means associated withthe positioning valve. and with the shifting member for actuating thelatter so that said triple gear cluster may be selectively shifted toany one of three positions from any other of. said positions. v I

21. In a sliding gear transmission a plurality of sliding gear clusters,a driven shaft, one. of

said clusters comprising a triple gear unit slidable on said shaft, andmeans for sliding said triple gear cluster to any one of threepositions, said means including a cluster shifting member, and a controlmeans for said member, said con-[ trol means including a source of fluidunder pressure, a positioning valve, means for controlling the flow offluid to said valve and means associated with the positioning valve and"with the shifting member for actuating the latter so that said triplegear cluster may be selectively shifted to any one of threepositionsfrom any other of said positions, said last named means comprising apair of cylinders, plungers in said cylinders, one of said plungersbeing operable hydraulically to position the said gear cluster at eitherextreme limit of motion on said shaft, the other of said plungers beingoperable to position said first plunger.

22.111 a slidinggear transmission a plurality of sliding gear clusters,asdriven shaft, one of said clusters comprising a triple gear unitslidable on said shaft, and means for sliding said triple gear clusterto any one of three positions,

said means includingv a cluster shifting member, and a control means forsaid member, said control means including a source of fluid underpressure, a positioning valve, means for con-' trolling the flow offluid to said valve and means associated with the positioning valve andwith the shifting member for actuating the latter so that'saidtriplegear cluster may be selectively shiftedto any oneof three positions fromany otherof said positions, said last named means comprising a pair ofcylinders-plungers in said cylinders, .one of said plungers beingoperable hydraulically-to position the said gear cluster at eitherextreme limit of motion on said shaft, and meansmovable by said oneplunger to operate said positioning valve.

23. In a sliding geartransmission a plurality of sliding gear-clusters,a driven shaft, one of said'clusters comprising a triple gear unitslidable on said shaft, and means for sliding said triple gear clusterto any one of three positions, said means including a cluster shiftingmember, and a control means for said member, said control meansincluding a source of fluid under pressure, a positioning valve, meansfor controlling the'flow of fluid to said valve and means associatedwiththe positioning valve and with the shifting member for actuating thelatter so that said triple gear cluster may be selectively shifted toany one of three positions from any other of said positions, 'saidlastnamed means comprising a pair ofcylinders, plungers in said cylinders,one of said plungers being operable hydraulically to position the saidgear cluster ateither extreme limit of motion on said shaft, and meansmovable by said one plunger to operate said positioning valve, the otherof said plungers being operable hydraulically through said positioningvalve, and having a driving connection with said first plunger, thestroke of the second plunger being substantially one-half that of thefirst named plunger.

l 24. In a sliding gear transmissiona plurality of sliding gearclusters, a driven shaft, one of said clusters comprising a triple gearunit slidable on said shaft, and means for sliding said triple gearcluster to any one of three positions, said means including a clustershifting member, and a control means for said member, said control meansincluding a source of fluid under pressure, a positioning valve, meansfor controlling the flow of fluid to said valve and means associatedwith the positioning valve and withthe shifting member for actuating thelatter so that said triple gear cluster may be selectively shifted toany. one of three positions from any other of said positions, said lastnamed means comprising a pairof cylinders, plungers in said cylinders,one of said plungers being operable hydraulically to position the said,gear cluster at either extreme limit of motion on said shaft, the otherof said plungers being operable hydraulically through said positioningvalve and having a driving connection with said first plunger, thestroke of the second plungerbeing substantially one half that of thefirst-named plunger.

25. Ina sliding gear transmission a plurality of sliding gear clusters,a driven shaft, one of said clusters comprising a triple gear unitslidable on said shaft, and means for sliding said triple gear Tclusterto any one of three positions, said meansincluding' a cluster shiftingmember, and a control means for said member, said control meansincluding a source of fluid under pressure, a positioning valve, meansfor controlling the flow of fluid to said valve and means associatedwith the positioning valve and with the shifting member for actuatingthe latter so that said triple gear cluster may be selectivelyshifted toany one of three positions from any other of said positions, said lastnamed means comprising a pair of cylinders, plungers in said cylinders,one

of said plungers being operable hydraulically to position the said gearcluster at either extreme limit of motion on said shaft, and meansmovable by said one plunger to operate said positioning valve, the otherof said plungers being operable hydraulically through said positioningvalve and having a driving connection with said first plunger, thestroke of the second plunger being substantially one-half that of thefirst named plunger whereby said first plunger may be moved from oneextreme position in its cylinder to a point intermediate its limits ofmovement therein.

OSKAR KYLIN. HENRIK 0. KYLIN.

